functions.php

function communities_init() {
        $args = [
        'label' => 'communities',
        'public' => true,
        'show_ui' => true,
        'capability_type' => true,
        'hierarchical' => false,
        'rewrite' => ['slug' => 'communities'],
        'query_var' => true,
        'menu_icon' => 'dashicons-video-alt',
        'supports' => [
                'name',
                'Description',
                'url',
                'image'],
        ];
        register_post_type( 'communities', $args );
}
add_action( 'init', 'communities_init');